v1.1.0: explorer tab, bootstrap fixes, full theme overlay merge

Explorer tab:
- New block explorer tab with search, chain stats, mempool info,
  recent blocks table, block detail modal with tx expansion
- Sidebar nav entry, i18n strings, ui.toml layout values

Bootstrap fixes:
- Move wizard Done handler into render() — was dead code, preventing
  startEmbeddedDaemon() and tryConnect() from firing post-wizard
- Stop deleting BDB database/ dir during cleanup — caused LSN mismatch
  that salvaged wallet.dat into wallet.{timestamp}.bak
- Add banlist.dat, db.log, .lock to cleanup file list
- Fatal extraction failure for blocks/ and chainstate/ files
- Verification progress: split SHA-256 (0-50%) and MD5 (50-100%)

Theme system:
- Expand overlay merge to apply ALL sections (tabs, dialogs, components,
  screens, flat sections), not just theme+backdrop+effects
- Add screens and security section parsing to UISchema
- Build-time theme expansion via expand_themes.py (CMake + build.sh)

Other:
- Version bump to 1.1.0
- WalletState::clear() resets all fields (sync, daemon info, etc.)
- Sidebar item-height 42 → 36

src/ui/sidebar.h

@@ -30,6 +30,7 @@ enum class NavPage {
     // --- separator ---
     Console,
     Peers,
+    Explorer,
     Settings,
     Count_
 };
@@ -51,6 +52,7 @@ inline const NavItem kNavItems[] = {
     { "Market",    NavPage::Market,   nullptr,    "market",   nullptr     },
     { "Console",   NavPage::Console,  "ADVANCED","console",  "advanced"  },
     { "Network",   NavPage::Peers,    nullptr,    "network",  nullptr     },
+    { "Explorer",  NavPage::Explorer, nullptr,    "explorer", nullptr     },
     { "Settings",  NavPage::Settings, nullptr,    "settings", nullptr     },
 };
 static_assert(sizeof(kNavItems) / sizeof(kNavItems[0]) == (int)NavPage::Count_,
@@ -76,6 +78,7 @@ inline const char* GetNavIconMD(NavPage page)
     case NavPage::Market:    return ICON_MD_TRENDING_UP;
     case NavPage::Console:   return ICON_MD_TERMINAL;
     case NavPage::Peers:     return ICON_MD_HUB;
+    case NavPage::Explorer:  return ICON_MD_EXPLORE;
     case NavPage::Settings:  return ICON_MD_SETTINGS;
     default:                 return ICON_MD_HOME;
     }